Pressure verses temperauture graph of an ideal gas of equal number of moles of different volumes are plotted as shown in figure. Choose the correct alternative.

From ideal gas equation,
Slope of curve,
It means line of smaller slope represent greater volume of gas. In the given problems, and
are on the same line so they will represent same volume, i.e.
Similarly, Points and
are on the same line so they will represent same volume, i.e.
Also, slope of line is less than
Hence,